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Efficient reliable UDP unicast, UDP multicast, and IPC transport protocol.
/*
* Copyright 2014-2024 Real Logic Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.aeron.driver;
import io.aeron.ChannelUri;
import io.aeron.driver.media.ControlTransportPoller;
import io.aeron.driver.media.SendChannelEndpoint;
import io.aeron.driver.status.DutyCycleStallTracker;
import org.agrona.collections.ArrayUtil;
import org.agrona.concurrent.Agent;
import org.agrona.concurrent.CachedNanoClock;
import org.agrona.concurrent.NanoClock;
import org.agrona.concurrent.OneToOneConcurrentArrayQueue;
import org.agrona.concurrent.status.AtomicCounter;
import java.net.InetSocketAddress;
import static io.aeron.driver.status.SystemCounterDescriptor.*;
class SenderLhsPadding
{
byte p000, p001, p002, p003, p004, p005, p006, p007, p008, p009, p010, p011, p012, p013, p014, p015;
byte p016, p017, p018, p019, p020, p021, p022, p023, p024, p025, p026, p027, p028, p029, p030, p031;
byte p032, p033, p034, p035, p036, p037, p038, p039, p040, p041, p042, p043, p044, p045, p046, p047;
byte p048, p049, p050, p051, p052, p053, p054, p055, p056, p057, p058, p059, p060, p061, p062, p063;
}
class SenderHotFields extends SenderLhsPadding
{
long controlPollDeadlineNs;
long reResolutionDeadlineNs;
int dutyCycleCounter;
int roundRobinIndex = 0;
}
class SenderRhsPadding extends SenderHotFields
{
byte p064, p065, p066, p067, p068, p069, p070, p071, p072, p073, p074, p075, p076, p077, p078, p079;
byte p080, p081, p082, p083, p084, p085, p086, p087, p088, p089, p090, p091, p092, p093, p094, p095;
byte p096, p097, p098, p099, p100, p101, p102, p103, p104, p105, p106, p107, p108, p109, p110, p111;
byte p112, p113, p114, p115, p116, p117, p118, p119, p120, p121, p122, p123, p124, p125, p126, p127;
}
/**
* Agent that iterates over {@link NetworkPublication}s for sending them to {@link Receiver}s on behalf of registered
* subscribers.
*/
public final class Sender extends SenderRhsPadding implements Agent
{
private NetworkPublication[] networkPublications = new NetworkPublication[0];
private final long statusMessageReadTimeoutNs;
private final long reResolutionCheckIntervalNs;
private final int dutyCycleRatio;
private final ControlTransportPoller controlTransportPoller;
private final OneToOneConcurrentArrayQueue commandQueue;
private final AtomicCounter totalBytesSent;
private final AtomicCounter resolutionChanges;
private final AtomicCounter shortSends;
private final NanoClock nanoClock;
private final CachedNanoClock cachedNanoClock;
private final DriverConductorProxy conductorProxy;
private final DutyCycleTracker dutyCycleTracker;
Sender(final MediaDriver.Context ctx)
{
controlTransportPoller = ctx.controlTransportPoller();
commandQueue = ctx.senderCommandQueue();
totalBytesSent = ctx.systemCounters().get(BYTES_SENT);
resolutionChanges = ctx.systemCounters().get(RESOLUTION_CHANGES);
shortSends = ctx.systemCounters().get(SHORT_SENDS);
nanoClock = ctx.nanoClock();
cachedNanoClock = ctx.senderCachedNanoClock();
statusMessageReadTimeoutNs = ctx.statusMessageTimeoutNs() >> 1;
reResolutionCheckIntervalNs = ctx.reResolutionCheckIntervalNs();
dutyCycleRatio = ctx.sendToStatusMessagePollRatio();
conductorProxy = ctx.driverConductorProxy();
dutyCycleTracker = ctx.senderDutyCycleTracker();
}
/**
* {@inheritDoc}
*/
public void onStart()
{
final long nowNs = nanoClock.nanoTime();
cachedNanoClock.update(nowNs);
dutyCycleTracker.update(nowNs);
reResolutionDeadlineNs = nowNs + reResolutionCheckIntervalNs;
if (dutyCycleTracker instanceof DutyCycleStallTracker)
{
final DutyCycleStallTracker dutyCycleStallTracker = (DutyCycleStallTracker)dutyCycleTracker;
final String threadingModeName = conductorProxy.threadingMode().name();
dutyCycleStallTracker.maxCycleTime().appendToLabel(": " + threadingModeName);
dutyCycleStallTracker.cycleTimeThresholdExceededCount().appendToLabel(
": threshold=" + dutyCycleStallTracker.cycleTimeThresholdNs() + "ns " + threadingModeName);
}
}
/**
* {@inheritDoc}
*/
public void onClose()
{
controlTransportPoller.close();
}
/**
* {@inheritDoc}
*/
public int doWork()
{
final long nowNs = nanoClock.nanoTime();
cachedNanoClock.update(nowNs);
dutyCycleTracker.measureAndUpdate(nowNs);
final int workCount = commandQueue.drain(CommandProxy.RUN_TASK, Configuration.COMMAND_DRAIN_LIMIT);
final long shortSendsBefore = shortSends.get();
final int bytesSent = doSend(nowNs);
int bytesReceived = 0;
if (0 == bytesSent ||
++dutyCycleCounter >= dutyCycleRatio ||
(controlPollDeadlineNs - nowNs < 0) ||
shortSendsBefore < shortSends.get())
{
bytesReceived = controlTransportPoller.pollTransports();
dutyCycleCounter = 0;
controlPollDeadlineNs = nowNs + statusMessageReadTimeoutNs;
}
if (reResolutionCheckIntervalNs > 0 && (reResolutionDeadlineNs - nowNs) < 0)
{
reResolutionDeadlineNs = nowNs + reResolutionCheckIntervalNs;
controlTransportPoller.checkForReResolutions(nowNs, conductorProxy);
}
return workCount + bytesSent + bytesReceived;
}
/**
* {@inheritDoc}
*/
public String roleName()
{
return "sender";
}
void onRegisterSendChannelEndpoint(final SendChannelEndpoint channelEndpoint)
{
channelEndpoint.openChannel(conductorProxy);
channelEndpoint.registerForRead(controlTransportPoller);
channelEndpoint.indicateActive();
}
void onCloseSendChannelEndpoint(final SendChannelEndpoint channelEndpoint)
{
channelEndpoint.close();
}
void onNewNetworkPublication(final NetworkPublication publication)
{
networkPublications = ArrayUtil.add(networkPublications, publication);
publication.channelEndpoint().registerForSend(publication);
}
void onRemoveNetworkPublication(final NetworkPublication publication)
{
networkPublications = ArrayUtil.remove(networkPublications, publication);
publication.channelEndpoint().unregisterForSend(publication);
publication.senderRelease();
}
void onAddDestination(
final SendChannelEndpoint channelEndpoint,
final ChannelUri channelUri,
final InetSocketAddress address,
final long registrationId)
{
channelEndpoint.addDestination(channelUri, address, registrationId);
}
void onRemoveDestination(
final SendChannelEndpoint channelEndpoint, final ChannelUri channelUri, final InetSocketAddress address)
{
channelEndpoint.removeDestination(channelUri, address);
}
void onRemoveDestination(final SendChannelEndpoint channelEndpoint, final long destinationRegistrationId)
{
channelEndpoint.removeDestination(destinationRegistrationId);
}
void onResolutionChange(
final SendChannelEndpoint channelEndpoint, final String endpoint, final InetSocketAddress newAddress)
{
channelEndpoint.resolutionChange(endpoint, newAddress);
resolutionChanges.getAndAddOrdered(1);
}
private int doSend(final long nowNs)
{
int bytesSent = 0;
final NetworkPublication[] publications = this.networkPublications;
final int length = publications.length;
int startingIndex = roundRobinIndex++;
if (startingIndex >= length)
{
roundRobinIndex = startingIndex = 0;
}
for (int i = startingIndex; i < length; i++)
{
bytesSent += publications[i].send(nowNs);
}
for (int i = 0; i < startingIndex; i++)
{
bytesSent += publications[i].send(nowNs);
}
totalBytesSent.getAndAddOrdered(bytesSent);
return bytesSent;
}
}
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